Screws? So?
That's just another way to go and/or look.
you can get screws with 'shoulders' or sleeves on them too.
there's all sorts of ways to do this... don't get to "paralysis by analysis", with it.
Maybe use shiny metal dowles. perhaps you could take a look around and seek out some solid metal dowles and add onto them some compliant sleeve to aid damping of resonances or vibrations too.
however I'd go with as strongly afixed as is possible... and without a back, and if no piece is to be added there as an additional brace, two per side.
I'd also use a drill guide to insure alignment and equal depths.
Start small with a pilot hole and then move up, to avoid splitting anything. if hard wood dowles can be found or turned down for you, I'd also choose them over the standard ones... but they would do as well actually.
just make the holes a hair larger than the dowles or pins for the adhesive to get inthere.